MCQ
20381. If the gravitational acceleration of any place is doubled, then the weight of a body will be-
g/2
g
2g
√2g
20382. The resultant of two force P & Q acting at an angle θ is-
√P^2+Q^2+2PQsinθ
√P^2+Q^2+2PQcosθ
√P^2+Q^2-2PQcosθ
20383. A redundant frame is also called- frame.
imperfect
deficient
perfect
20384. A framed structure is imperfect, if the number of members are ---(2j-3).
equal to
less than
greater than
either b or c
20385. The friction experienced by a body, when at rest, is known as-
static friction
dynamic friction
limiting friction
coefficient of friction
20386. A smooth cylinder lying on its convex surface remains in- equilibrium.
stable
neutral
unstable
none of these
20387. The moment of inertia of a square of side a about an axis through its centre of gravity is-
a^4 /4
a^4 /8
a^4 /12
a^4 /36
20388. The center of gravity of a semi-circle lies at a distance of ----from its base measured along the vertical radius. 8r
3r/8
3r/4π
4r/3π
8r/3
20389. The center of gravity of a right circular solid cone is at a distance of---- from its base, measured along the vertical axis.
h/2
h/3
h/4
h/6
20390. If the resultant of two force P & Q acting at an angle θ, makes an angle α with force P, then-
tanα = P sinθ / P+Q cosθ
tanα = P cosθ / P+Q cosθ
tanα = Q sinθ / P+Q cosθ
20391. The center of gravity of a T-section 100mm x 150mm x 50mm from its bottom is-
50mm
75mm
87.5mm
125mm
ব্যাখ্যা: [Note]: ¯x=a₁ x₁ + a₂ x₂ /a₁ + a₂
=(100x50x125) + (50×100×50) / (100x50) + (50x100) = 87.5
20392. A force acting in the opposite direction to the motion of the body is called force of friction.
Agree
Disagree
20393. An irregular body may have more than one centre of gravity.....
Yes
No
20394. Which of the following is a scalar quantity?
Force
Acceleration
Speed
Velocity
20395. If the resultant of a number of forces acting on a body is 0. Then the body will be equilibrium........
Yes
No
20396. The slope of a stress-strain curve in the elastic deformation region is-
elastic modulus
plastic modulus
poison's ratio
none of the above
20397. Moment of inertia of a circular section about an axis perpendicular to the section is-
πd³/16
πd³/32
πd^4/64
πd^4/32
ব্যাখ্যা: Izz = Ixx + Iyy = πd^2 /32
20398. The friction experienced by a body, when in motion, is known as-
rolling friction
static friction
limiting friction
dynamic friction
20399. The minimum force required to slide a body of weight W on a rough horizontal plane is-
W sineθ
W coseθ
W tanθ
none of these
20400. The rate of change of displacement of a body is called
velocity
momentum
acceleration
none of these